static synchronized S manageSnippetList(S s, S name, S varName) {
  L<S> list = (L) get(main.class, varName);
  new Matches m;
  
  if (match("list " + plural(name), s))
    ret structure(list);
    
  if (match("how many " + plural(name), s))
    ret str(l(list));
    
  if (webAuthed() || litlist("yes", "partially").contains(isTrustedUser())) {
    if (match("add " + name + " *", s, m)) {
      S id = m.fsi(0);
      list.add(id);
      save(varName);
      ret "OK, " + name + " " + id + " added. List size now: " + l(list);
    }
    
    if (match("remove " + name + " *", s, m)) {
      S id = m.fsi(0);
      int idx = list.indexOf(id);
      if (idx < 0) ret id + " is not a " + name;
      list.remove(idx);
      save(varName);
      ret "OK, " + name + " " + id + " removed. List size now: " + l(list);
    }
  }
  
  ret null;
}